Ken drove from Town T to Town U which was 624 km away. He started from Town T at an average speed of 62 km/h. He maintained this speed for 2 h before increasing it by 6 km/h for the rest of the journey to Town U.
- How long did he take to complete the whole journey?
- What was his average speed from Town T to Town U?
(a)
Distance of 1st part of the journey
= 2 x 62
= 124 km
New speed for rest of the journey
= 62 + 6
= 68 km / h
Remaining distance for rest of the journey
= 624 - 124
= 500 km
Time taken for rest of the journey
= 500 ÷ 68
= 6 h
Total time taken
= 2 + 6
= 8 h
(b)
Average speed of the whole journey
= 624 ÷ 8
= 78 km
Answer(s): (a) 8 h; (b) 78km/h